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usb: dwc3: clean TRB if STARTTRANSFER fail

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In case STARTTRANSFER will fail, clean TRB.
Seems HW in such case don't clean HWO bit.
So, without this cleanup prev_trb still have
HWO bit set.

In my case (without patch), after first START failed:
- dep->enqueue == 1
- dep->dequeue == 1
- prev_trb still have HWO set
- left_trb() == 0
No way to send more data.

Signed-off-by: Janusz Dziedzic <januszx.dziedzic@linux.intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Janusz Dziedzic 2016-11-09 11:01:32 +01:00 • committed by Felipe Balbi
parent 8ab89da4c2
commit ce3fc8b329
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/dwc3/gadget.c
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@ -1084,6 +1084,8 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep, u16 cmd_param)
* here and stop, unmap, free and del each of the linked
* requests instead of what we do now.
*/
if (req->trb)
memset(req->trb, 0, sizeof(struct dwc3_trb));
dep->queued_requests--;
dwc3_gadget_giveback(dep, req, ret);
return ret;